How many d block elements are present in periodic table?
Answers
Answer:
30 elements
Explanation:
An element which is between group 2 and group 3 on the periodic table, but not one of the lanthanides, which are usually shown below the periodic table.
Elements in each group have four different subshells. They are s which has space for two electrons, p which has space for six, d which has space for ten, and f which has space for fourteen. A new subshell becomes available each time you go down a period in the periodic table.
For a d-block element, the atom’s outermost d-shell is either filled or partially filled, as well as the s-shell which is on the outside of that. I.e copper’s electron configuration is [Ar] 3d^10 4s^1.
Its third d subshell contains electrons, and so does the 4s subshell, but not 4p or further.
The 4s subshell generally fills before 3d. Same for 5s filling before 4d and so on. In copper however, 4s is only half-filled with 3d being fully filled as this is energetically more stable and it is easy to occur as copper’s 3d orbital would be almost fully filled anyway, i.e 3d^9.
Note: all transition metals are d-block elements but not all d-block elements are transition metals.